\begin{table}[ht] \centering
\newcolumntype{R}{>{\raggedleft\arraybackslash}X}
\newcolumntype{L}{>{\raggedright\arraybackslash}X}
\newcolumntype{C}{>{\centering\arraybackslash}X}

\caption{Test}
\label{tab:abi_denv}
{\scriptsize
\begin{tabularx}{\raggedleft}{@{}lCCCC@{}}

\toprule
&{(1)}&{(2)}&{(3)}&{(4)} \tabularnewline \midrule
{}&{}&{}&{}&{} \tabularnewline
\midrule \addlinespace[\belowrulesep]
Slow Mean&0.178&0.968&0.669&0.794 \tabularnewline
Fast Mean&0.184&0.977&1.103&0.889 \tabularnewline
P-value&(0.172)&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\} \tabularnewline
N&4617.000&9540.000&9540.000&9540.000 \tabularnewline
Normal Mean&0.162&0.986&0.948&0.923 \tabularnewline
Fast Mean&0.184&0.977&1.103&0.889 \tabularnewline
P-value&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\} \tabularnewline
N&8511.000&1.7e+04&1.7e+04&1.7e+04 \tabularnewline
Slow Mean&0.178&0.968&0.669&0.794 \tabularnewline
Normal Mean&0.162&0.986&0.948&0.923 \tabularnewline
P-value&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\} \tabularnewline
N&6086.000&1.1e+04&1.1e+04&1.1e+04 \tabularnewline
\bottomrule \addlinespace[\belowrulesep]

\end{tabularx}
\\ \parbox{\raggedleft}{\scriptsize Note:}
}
\end{table}
